s of wood are driveji fewer than 1,250.000 car wheels in daily use on the railroads plate, A, and the under surface of plate, B, do not come in between the rim and the tyre, in order to absorb the jarring of the United States. Each wheel travels 88'75 miles per contact, the bearing being had… … day of 330 days per annum, and its average load is 3J tuns. With this stress, the life of the wheel is about 45,000 miles, or 1 58 years On trains running at express speeds, the ave- rage life does not exceed 10 months' service, while wheels under tender trucks have a life of 18 months. A freight…
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